Аналіз основних факторів, що визначають аерогідродинамічний опір у високошвидкісних зубчастих передачах

Abstract

This paper presents a discussion of the nature of windage and churning power losses. Relatively straightforward analytical mathematical expressions are offered to determine the energy efficiency of highspeed gears. A series of formulas which enable accurate prediction of windage and churning power losses for one pinion characteristic of gear transmission geometry and prediction of physical properties of lubrication are presented. Presented dependencies allow to calculate energy efficiencies of high-speed gears with minimum calculation efforts not only taking into an account mechanical friction losses, but also taking into account windage and churning power losses. Specific gravities for different kinds of power losses are presented. Analytical dependencies of oil-air density on gear transmission geometries (rotational speed, tooth face width, radial and axial clearances, helix angle) are obtained based on mass balance. Influence limits are studied for the effect of the end gaps on the power losses, and for the effectiveness of lubrication by immersion in an oil bath.